12.21 Zone entry signs for both types of CPZ, facing approaching traffic, must be placed on each side of the road or on each side of the appropriate carriageway of a dual carriageway road at every entry point. If the road is a side road at a junction and is less than 5 m wide, one zone entry sign might be sufficient (see direction 8 and para 1.19). The boundary of a zone, particularly on a main through road, should be carefully chosen so that the entry sign is not in conflict with other traffic signs, traffic signals, pedestrian crossings etc. which demand a driver's attention. Locations where the zone entry signs are likely to be obscured by large vehicles (e.g. delivery vans, or buses at bus stops) should be avoided. The zone end sign, when placed on a two—way road, will normally be mounted back to back with the entry sign.
12.22 The choice of x—height, the siting of signs and the provision of road markings for waiting and loading restrictions within a type (a) CPZ should be in accordance with section 6. Signs indicating a prohibition of waiting or a prohibition of loading may be omitted where these prohibitions operate at the same times as shown on the zone entry sign (see para 12.2). The choice of x—height for the sign to diagram 640.2A within a type (b) CPZ should also be in accordance with section 6 (see para 6.33).
12.23 The choice of x—height, the siting of signs and the provision of road markings for parking places within a type (a) CPZ should be in accordance with section 7. For disc or ticket zones, the sign to diagram 662 is used in a similar manner to the sign shown in diagram 661.1 (see para 7.8), except that it cannot be used to indicate a parking place for a particular class of vehicle such as a bus. The bay marking used with diagram 662 is diagram 1028.4, 1032 or 1033, in each case without any legend.
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